package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService{

    @Autowired
    private SetmealDishService setmealDishService;
    @Autowired
    private CategoryService categoryService;
    @Autowired
    private DishService dishService;


    /**
     * 回显套餐数据：根据套餐id查询套餐
     * @param id
     * @return
     */
    @Override
    public SetmealDto getDate(Long id) {
        Setmeal setmeal = this.getById(id);
        SetmealDto setmealDto=new SetmealDto();
        LambdaQueryWrapper<SetmealDish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(id!=null,SetmealDish::getSetmealId,id);
        if (setmeal!=null){
            BeanUtils.copyProperties(setmeal,setmealDto);
            List<SetmealDish> list = setmealDishService.list(queryWrapper);
            setmealDto.setSetmealDishes(list);
            return setmealDto;
        }
        return null;
    }

    /**
     * 对菜品批量或者是单个 进行停售或者是起售
     * @param ids
     */
    @Override
    public void updateSetmealStatusById(Integer status,List<Long> ids) {
        LambdaQueryWrapper<Setmeal> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.in(ids!=null,Setmeal::getId,ids);
        List<Setmeal> list = this.list(queryWrapper);
        for (Setmeal setmeal : list) {
            if (setmeal!=null){
                setmeal.setStatus(status);
                this.updateById(setmeal);
            }
        }
    }

    /**
     * 修改套餐
     * @param setmealDto
     */
    @Override
    public boolean updateSetmeal(SetmealDto setmealDto) {
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        Long setmealDtoId = setmealDto.getId();
        LambdaQueryWrapper<SetmealDish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmealDtoId);
        setmealDishService.remove(queryWrapper);
        //为setmeal_dish表填充相关的属性
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealDtoId);
        }
        //批量把setmealDish保存到setmeal_dish表
        setmealDishService.saveBatch(setmealDishes);
       return this.updateById(setmealDto);
    }

    /**新增套餐，同时需要保存套餐和菜品的关联关系
     *
     * @param setmealDto
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);

    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if(count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }

        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(lambdaQueryWrapper);
    }

    /**
     * 根据套餐id查询套餐数据
     * @param id
     * @return
     */
    @Override
    public List<DishDto> getDish(Long id) {
        LambdaQueryWrapper<SetmealDish> queryWrapper=new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,id);
        //获取套餐里面的所有菜品  这个就是SetmealDish表里面的数据
        List<SetmealDish> list = setmealDishService.list(queryWrapper);

        List<DishDto> dishDtos=list.stream().map((setmealDish) -> {
            DishDto dishDto=new DishDto();
            //其实这个BeanUtils的拷贝是浅拷贝，这里要注意一下
            BeanUtils.copyProperties(setmealDish,dishDto);
            //这里是为了把套餐中的菜品的基本信息填充到dto中，比如菜品描述，菜品图片等菜品的基本信息
            Long dishId = setmealDish.getDishId();
            Dish dish = dishService.getById(dishId);
            BeanUtils.copyProperties(dish,dishDto);
            return dishDto;
        }).collect(Collectors.toList());

        return dishDtos;
    }
}
